import time

from orm.common.orm_common.injector import injector
from orm.common.orm_common.utils import utils
from orm.services.image_manager.ims.logger import get_logger
from orm.services.image_manager.ims.logic.error_base import \
    ErrorStatus, NotFoundError
from orm.services.image_manager.ims.persistency.sql_alchemy.db_models import \
    ImageCustomer, ImageRegion
from orm.services.image_manager.ims.persistency.wsme.models import (
    ImageSummary, ImageSummaryResponse, ImageWrapper, RegionWrapper)
from orm.services.image_manager.ims.utils import utils as ImsUtils
import oslo_db

LOG = get_logger(__name__)

di = injector.get_di()


@di.dependsOn('data_manager')
def create_image(image_wrapper, image_uuid, transaction_id):
    DataManager = di.resolver.unpack(create_image)
    datamanager = DataManager()
    image_wrapper.image.id = image_uuid

    image_wrapper.image.created_at = str(int(time.time()))
    image_wrapper.image.updated_at = image_wrapper.image.created_at

    try:
        image_wrapper.handle_region_group()
        image_wrapper.validate_model()
        sql_image = image_wrapper.to_db_model()

        image_rec = datamanager.get_record('image')

        datamanager.begin_transaction()
        image_rec.insert(sql_image)
        datamanager.flush()  # i want to get any exception created by this
        # insert
        existing_region_names = []
        send_to_rds_if_needed(sql_image, existing_region_names, "post",
                              transaction_id)

        datamanager.commit()

        ret_image = get_image_by_uuid(image_uuid)
        return ret_image

    except oslo_db.exception.DBDuplicateEntry as exception:
        utils.delete_uuid(image_uuid)
        raise ErrorStatus(
            409.2, "Image name '{}' already exists".format(
                image_wrapper.image.name))

    except Exception as exp:
        LOG.log_exception("ImageLogic - Failed to CreateImage", exp)
        datamanager.rollback()
        utils.delete_uuid(image_uuid)
        raise


@di.dependsOn('rds_proxy')
def send_to_rds_if_needed(sql_image, existing_region_names, http_action,
                          transaction_id):
    rds_proxy = di.resolver.unpack(send_to_rds_if_needed)
    if (sql_image.regions and len(sql_image.regions) > 0) or len(
            existing_region_names) > 0:
        image_dict = sql_image.get_proxy_dict()
        update_region_actions(image_dict, existing_region_names, http_action)
        if image_dict['regions'] or len(existing_region_names) > 0:
            LOG.debug("Image is valid, sending to RDS Proxy ")
            rds_proxy.send_image(image_dict, transaction_id, http_action)
        else:
            LOG.debug("Group with no regions, not sending to RDS Proxy " + str(
                sql_image))
    else:
        LOG.debug("Image with no regions, not sending to RDS Proxy " + str(
            sql_image))


@di.dependsOn('data_manager')
def update_image(image_wrapper, image_uuid, transaction_id, http_action="put"):
    DataManager = di.resolver.unpack(update_image)
    datamanager = DataManager()

    try:
        image_wrapper.validate_model('update')
        new_image = image_wrapper.to_db_model()
        new_image.id = image_uuid

        image_rec = datamanager.get_record('image')
        sql_image = image_rec.get_image_by_id(image_uuid)

        if sql_image is None:
            raise NotFoundError(
                status_code=404,
                message="Image {0} does not exist for update".format(
                    image_uuid))

        image_wrapper.validate_update(sql_image, new_image)

        datamanager.begin_transaction()

        new_image.owner = sql_image.owner
        existing_regions = sql_image.get_existing_region_names()
        new_image.created_at = int(sql_image.created_at)
        new_image.updated_at = int(time.time())
        # result = image_rec.delete_image_by_id(image_uuid)
        datamanager.get_session().delete(sql_image)
        # del sql_image
        image_rec.insert(new_image)
        datamanager.flush()

        send_to_rds_if_needed(new_image, existing_regions, http_action,
                              transaction_id)

        datamanager.commit()

        ret_image = get_image_by_uuid(image_uuid)

        return ret_image

    except Exception as exp:
        datamanager.rollback()
        LOG.log_exception("ImageLogic - Failed to update image", exp)
        raise


@di.dependsOn('data_manager')
def delete_image_by_uuid(image_uuid, transaction_id):
    DataManager = di.resolver.unpack(delete_image_by_uuid)
    datamanager = DataManager()

    try:
        datamanager.begin_transaction()
        image_rec = datamanager.get_record('image')

        sql_image = image_rec.get_image_by_id(image_uuid)
        if sql_image is None:
            message_not_found = "Image '{}' not found".format(image_uuid)
            raise ErrorStatus(404, message_not_found)

        image_existing_region_names = sql_image.get_existing_region_names()
        if len(image_existing_region_names) > 0:
            # Do not delete an image that still has region(s)
            raise ErrorStatus(405,
                              "Cannot delete a image with regions. "
                              "Please delete the regions first and then "
                              "delete the image. ")

        # Get status from resource status table
        uuid = [sql_image.id]
        resource_status_dict = utils.get_resource_status_from_db(
            datamanager.get_session(), uuid)
        status_model = resource_status_dict.get(sql_image.id)

        if status_model:
            status = status_model.status
            LOG.debug('Status from resource_status table: {}'.format(status))
        else:
            # Image not found in table, that means it never had any
            # regions. So it is OK to delete it
            status = 'Success'
            LOG.debug('Resource not found in table, so it is OK to delete')

        if status != 'Success':
            raise ErrorStatus(405, "not allowed as aggregate status "
                              "have to be Success (either the deletion "
                              "failed on one of the regions or it is "
                              "still in progress)")

        image_rec.delete_image_by_id(image_uuid)
        datamanager.flush()  # i want to get any exception created by this

        # delete
        datamanager.commit()

        # after successful image delete, delete image id from uuids table
        utils.delete_uuid(image_uuid)

    except Exception as exp:
        LOG.log_exception("ImageLogic - Failed to delete image", exp)
        datamanager.rollback()
        raise


@di.dependsOn('data_manager')
def add_regions(image_uuid, regions, transaction_id):
    DataManager = di.resolver.unpack(add_regions)
    datamanager = DataManager()

    try:
        image_rec = datamanager.get_record('image')
        sql_image = image_rec.get_image_by_id(image_uuid)
        if not sql_image:
            raise ErrorStatus(404, 'image with id: {0} not found'.format(
                image_uuid))

        existing_region_names = sql_image.get_existing_region_names()

        for region in regions.regions:
            db_region = ImageRegion(region_name=region.name,
                                    region_type=region.type)
            sql_image.add_region(db_region)

        datamanager.flush()  # i want to get any exception created by
        # previous actions against the database

        send_to_rds_if_needed(sql_image, existing_region_names, "put",
                              transaction_id)

        datamanager.commit()

        image_wrapper = get_image_by_uuid(image_uuid)
        ret = RegionWrapper(regions=image_wrapper.image.regions)
        return ret

    except ErrorStatus as exp:
        LOG.log_exception("ImageLogic - Failed to add regions", exp)
        datamanager.rollback()
        raise exp
    except Exception as exp:
        LOG.log_exception("ImageLogic - Failed to add regions", exp)
        datamanager.rollback()
        raise exp


@di.dependsOn('data_manager')
def replace_regions(image_uuid, regions, transaction_id):
    DataManager = di.resolver.unpack(replace_regions)
    datamanager = DataManager()

    try:
        image_rec = datamanager.get_record('image')
        sql_image = image_rec.get_image_by_id(image_uuid)
        if not sql_image:
            raise ErrorStatus(404, 'image with id: {0} not found'.format(
                image_uuid))

        existing_region_names = sql_image.get_existing_region_names()

        sql_image.remove_all_regions()
        datamanager.flush()

        for region in regions.regions:
            db_region = ImageRegion(region_name=region.name,
                                    region_type=region.type)
            sql_image.add_region(db_region)
        datamanager.flush()  # i want to get any exception created by
        # previous actions against the database

        send_to_rds_if_needed(sql_image, existing_region_names, "put",
                              transaction_id)

        datamanager.commit()

        image_wrapper = get_image_by_uuid(image_uuid)
        ret = RegionWrapper(regions=image_wrapper.image.regions)
        return ret

    except ErrorStatus as exp:
        LOG.log_exception("ImageLogic - Failed to replace regions", exp)
        datamanager.rollback()
        raise exp
    except Exception as exp:
        LOG.log_exception("ImageLogic - Failed to repalce regions", exp)
        datamanager.rollback()
        raise exp


@di.dependsOn('data_manager')
def delete_region(image_uuid, region_name, transaction_id, force_delete):
    DataManager = di.resolver.unpack(delete_region)
    datamanager = DataManager()

    try:
        image_rec = datamanager.get_record('image')
        sql_image = image_rec.get_image_by_id(image_uuid)
        if not sql_image:
            raise ErrorStatus(404, 'image with id: {0} not found'.format(
                              image_uuid))
        # do not allow delete_region for protected images
        if sql_image.protected:
            protect_msg = "Protected image {} cannot be deleted. Please " \
                          "update image with protected=false and try again"
            raise ErrorStatus(400, protect_msg.format(image_uuid))

        existing_region_names = sql_image.get_existing_region_names()
        sql_image.remove_region(region_name)

        # Get any exception created by previous actions against the database
        datamanager.flush()

        send_to_rds_if_needed(sql_image, existing_region_names, "put",
                              transaction_id)
        if force_delete:
            datamanager.commit()
        else:
            datamanager.rollback()

    except ErrorStatus as exp:
        LOG.log_exception("ImageLogic - Failed to update image", exp)
        datamanager.rollback()
        raise

    except Exception as exp:
        LOG.log_exception("ImageLogic - Failed to delete region", exp)
        datamanager.rollback()
        raise

    finally:
        datamanager.close()


@di.dependsOn('data_manager')
def add_customers(image_uuid, customers, transaction_id):
    DataManager = di.resolver.unpack(add_customers)
    datamanager = DataManager()

    try:
        image_rec = datamanager.get_record('image')
        sql_image = image_rec.get_image_by_id(image_uuid)
        if not sql_image:
            raise ErrorStatus(404, 'image with id: {0} not found'.format(
                image_uuid))

        if sql_image.visibility != "shared":
            raise ErrorStatus(400,
                              'Customer can only be added to shared image.')

        existing_region_names = sql_image.get_existing_region_names()

        for user in customers.customers:
            db_Customer = ImageCustomer(customer_id=user)
            sql_image.add_customer(db_Customer)

        datamanager.flush()  # i want to get any exception created by
        # previous actions against the database
        send_to_rds_if_needed(sql_image, existing_region_names, "put",
                              transaction_id)
        datamanager.commit()

        ret_image = get_image_by_uuid(image_uuid)
        return ret_image

    except Exception as exp:
        if 'conflicts with persistent instance' in str(exp) or \
                'Duplicate entry' in str(exp):
            raise ErrorStatus(409, "Duplicate Customer for Image")
        LOG.log_exception("ImageLogic - Failed to add Customers", exp)
        datamanager.rollback()
        raise


@di.dependsOn('data_manager')
def replace_customers(image_uuid, customers, transaction_id):
    DataManager = di.resolver.unpack(replace_customers)
    datamanager = DataManager()

    try:
        image_rec = datamanager.get_record('image')
        sql_image = image_rec.get_image_by_id(image_uuid)
        if not sql_image:
            raise ErrorStatus(404, 'image {0} not found'.format(image_uuid))

        if sql_image.visibility != "shared":
            raise ValueError('Customer can only be replaced with shared Image')

        existing_region_names = sql_image.get_existing_region_names()
        sql_image.remove_all_customers()
        datamanager.flush()

        for cust in customers.customers:
            db_Customer = ImageCustomer(customer_id=cust)
            sql_image.add_customer(db_Customer)

        datamanager.flush()  # get exception created by previous db actions
        send_to_rds_if_needed(sql_image, existing_region_names, "put",
                              transaction_id)
        datamanager.commit()

        ret_image = get_image_by_uuid(image_uuid)
        return ret_image

    except Exception as exp:
        if 'conflicts with persistent instance' in str(exp) or \
                'Duplicate entry' in str(exp):
            raise ErrorStatus(409, "Duplicate Customer for Image")
        LOG.log_exception("ImageLogic - Failed to add Customers", exp)
        datamanager.rollback()
        raise


@di.dependsOn('data_manager')
def delete_customer(image_uuid, customer_id, transaction_id):
    DataManager = di.resolver.unpack(delete_customer)
    datamanager = DataManager()

    try:
        image_rec = datamanager.get_record('image')
        sql_image = image_rec.get_image_by_id(image_uuid)
        if not sql_image:
            raise ErrorStatus(404, 'image {0} not found'.format(image_uuid))

        if sql_image.visibility != "shared":
            raise ValueError(
                "Customer can only be deleted from shared image {}".format(
                    image_uuid))

        existing_region_names = sql_image.get_existing_region_names()
        sql_image.remove_customer(customer_id)

        datamanager.flush()  # i want to get any exception created by
        # previous actions against the database
        send_to_rds_if_needed(sql_image, existing_region_names, "put",
                              transaction_id)
        datamanager.commit()

    except Exception as exp:
        LOG.log_exception("ImageLogic - Failed to delete Customer", exp)
        datamanager.rollback()
        raise


def set_resource_status(sql_image, status_model):
    image_wrapper = ImageWrapper.from_db_model(sql_image)
    image_wrapper.image.status = 'no regions'

    if status_model and status_model.regions:
        for region in image_wrapper.image.regions:
            for status in status_model.regions:
                if status.region == region.name:
                    region.status = status.status
                    if status.error_msg:
                        region.set_error_message(status.error_msg)

        image_wrapper.image.status = status_model.status

    return image_wrapper


@di.dependsOn('data_manager')
def get_image_by_uuid(image_uuid, query_by_id_or_name=False):
    """This function includes an optional boolean parameter
      query_by_id_or_name. If query_by_id_or_name evaluates to true, IMS logic
      will fetch the image record whose "image_uuid" parameter value matches
      either the image id or name value. Otherwise, it defaults to query by
      image ID value only.
    """
    DataManager = di.resolver.unpack(get_image_by_uuid)
    datamanager = DataManager()

    LOG.debug("Get image by uuid : {}".format(image_uuid))
    try:

        datamanager.begin_transaction()
        image_rec = datamanager.get_record('image')

        # Only the get_image API will pass the optional parameter and
        # set it to true
        if query_by_id_or_name:
            sql_image = image_rec.get_image(image_uuid)
        else:
            # all other image APIs will NOT pass the optional parameter
            sql_image = image_rec.get_image_by_id(image_uuid)

        if not sql_image:
            raise NotFoundError(
                status_code=404,
                message="Image {0} not found ".format(image_uuid))

        # Get the status from resource table
        uuid = [sql_image.id]
        resource_status_dict = utils.get_resource_status_from_db(
            datamanager.get_session(), uuid)
        status_model = resource_status_dict.get(sql_image.id)

        image_wrapper = set_resource_status(sql_image, status_model)

        # get image own link
        image_wrapper.image.links, image_wrapper.image.self_link = \
            ImsUtils.get_server_links(image_uuid)

        # convert time stamp format to human readable time
        image_wrapper.image.created_at = ImsUtils.convert_time_human(
            image_wrapper.image.created_at)
        image_wrapper.image.updated_at = ImsUtils.convert_time_human(
            image_wrapper.image.updated_at)

    except NotFoundError as exp:
        datamanager.rollback()
        LOG.log_exception("ImageLogic - Failed to update image", exp)
        raise exp

    except Exception as exp:
        datamanager.rollback()
        LOG.log_exception("ImageLogic - Failed to delete Customer", exp)
        raise

    return image_wrapper


@di.dependsOn('data_manager')
def get_image_list_by_params(visibility, region, Customer):
    DataManager = di.resolver.unpack(get_image_list_by_params)
    datamanager = DataManager()

    try:
        image_record = datamanager.get_record('image')
        sql_images = image_record.get_images_by_criteria(visibility=visibility,
                                                         region=region,
                                                         Customer=Customer)

        response = ImageSummaryResponse()
        if sql_images:
            uuids = [sql_image.id for sql_image in sql_images]
            resource_status_dict = utils.get_resource_status_from_db(
                datamanager.get_session(), uuids)

            for sql_image in sql_images:
                status_model = resource_status_dict.get(sql_image.id)
                wsme_image = set_resource_status(sql_image, status_model)
                image_summary = ImageSummary.from_wsme(wsme_image)
                response.images.append(image_summary)

        return response

    except ErrorStatus as exp:
        LOG.log_exception("ImageLogic - Failed to get list", exp)
        raise
    except Exception as exp:
        LOG.log_exception("ImageLogic - Failed to get list", exp)
        raise


def update_region_actions(image_dict, existing_region_names, action="put"):
    if action == "delete":
        set_regions_action(image_dict, "delete")
    elif action == "post":
        set_regions_action(image_dict, "create")
    else:  # put
        for region in image_dict["regions"]:
            if region["name"] in existing_region_names:
                region["action"] = "modify"
            else:
                region["action"] = "create"

        # add deleted regions
        for exist_region_name in existing_region_names:
            if region_name_exist_in_regions(exist_region_name,
                                            image_dict["regions"]):
                continue
            else:
                image_dict["regions"].append(
                    {"name": exist_region_name, "action": "delete"})


def region_name_exist_in_regions(region_name, regions):
    for region in regions:
        if region["name"] == region_name:
            return True
    return False


def set_regions_action(image_dict, action):
    for region in image_dict["regions"]:
        region["action"] = action


@di.dependsOn('data_manager')
def enable_image(image_uuid, int_enabled, transaction_id):
    DataManager = di.resolver.unpack(enable_image)
    datamanager = DataManager()

    try:
        image_rec = datamanager.get_record('image')
        sql_image = image_rec.get_image_by_id(image_uuid)
        if not sql_image:
            raise ErrorStatus(404, 'Image with id: {0} not found'.format(
                image_uuid))

        sql_image.enabled = int_enabled

        existing_region_names = sql_image.get_existing_region_names()

        datamanager.flush()  # i want to get any exception created by this
        # insert method

        send_to_rds_if_needed(sql_image, existing_region_names, "put",
                              transaction_id)

        datamanager.commit()

        ret_image = get_image_by_uuid(image_uuid)
        return ret_image

    except ErrorStatus as exp:
        LOG.log_exception(
            "ImageLogic - Failed to change image activation value", exp)
        datamanager.rollback()
        raise exp
    except Exception as exp:
        LOG.log_exception(
            "ImageLogic - Failed to change image activation value", exp)
        datamanager.rollback()
        raise exp